Quiz of Area of Triangles and Trapezium (riangles and Trapezium (三角形及梯形面積測驗)

截止日期無截止日期
分數 7
問題 5
時間限制無

說明

According to the previous video, we learn the formula of the areas of triangles and trapezia:

Area of triangle LaTeX: = open parentheses b a s e cross times h e i g h t close parentheses divided by 2

Area of trapezium LaTeX: = open parentheses u p p e r space b a s e plus l o w e r space b a s e close parentheses cross times h e i g h t divided by 2

根據前面的影片，我們認識了以下三角形及梯形面積的公式︰

三角形面積 LaTeX: = open parentheses straight 底 cross times straight 高 close parentheses divided by 2

梯形面積 LaTeX: = open parentheses 上底 plus 下底 close parentheses cross times straight 高 divided by 2

Example 1:

例題一︰

Find the area of the following triangle.

計算以下三角形的面積。

Triangle area example.png

Ans: Area of triangle LaTeX: = (19 $LaTeX: \times$ 8) $LaTeX: \div$ 2

LaTeX: = 76 cm²

答︰　三角形面積 LaTeX: = (19 $LaTeX: \times$ 8) $LaTeX: \div$ 2

LaTeX: = 76 cm²

Example 2:

例題二︰

Find the area of the following trapezium.

計算以下梯形的面積。

Trapezoid area example.png

Ans: Area of trapezium LaTeX: = (13 + 35) $LaTeX: \times$ 20 $LaTeX: \div$ 2

LaTeX: = 480 m²

答︰　梯形面積 LaTeX: = (13 + 35) $LaTeX: \times$ 20 $LaTeX: \div$ 2

LaTeX: = 480 m²

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